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Financial Statement Details - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 25,134	$ 35,129
Less—accumulated depreciation and amortization	(18,436)	(28,138)
Property, plant and equipment, net	6,698	6,991
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	247	288
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,247	2,614
Test equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,444	23,396
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,889	5,548
Product tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	504	449
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	677	564
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,990	2,003
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 136	$ 267

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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